wrote in message
oups.com...
Can anyone tell me (or tell me how to calculate) what imposed snow
loading I need to allow for. The roof will be 12 degrees monopitch, 4
metres ridge, 5 metres rafters. Yes, it's on "sideways" ! Couldn't find
it in the regs. I've got the span tables from the 1992 part A.
Cheers,
Simon.


Roof pitch makes no difference. The amount of snow that the roof has to
support is the same, whatever the pitch. Therefore the to take for snow
loading is the plan area, not the slope area.

In the 1992 version of Part A there is a diagram on page 12 which shows that
in your location you need to allow 0.75kN/m² if you are below 100m above sea
level, or 1.00kN/m² if you are above.

I am not clear if these figures have changed since the 2004 version was
published. There are no details in Part A. You will need to look at
BS6399:Part 3. I don't have access to that right now, sorry.